The acid catalysed reaction of 1,4-diketones with hydrogen sulphide
作者:F. Duus
DOI:10.1016/0040-4020(76)80129-9
日期:1976.1
with H2S in acidic ethanol to give 2,5- or higher substituted thiophens as resulting from a spontaneous ring-closure reaction of initially formed sulphur analogues of the starting diketones. In some the corresponding 2-mercapto-2,3-dihydrothiophens and/or 2,5-dimercaptotetrahydrothiophens were formed as by-products. 1,4-Diphenyl-1,4-diketones behaved exceptionally under similar reaction conditions yielding